sja1000_isa.c revision 829e0015431537176e38812f88fffe1d3250083e 
1/*
2 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the version 2 of the GNU General Public License
6 * as published by the Free Software Foundation
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/isa.h>
21#include <linux/interrupt.h>
22#include <linux/netdevice.h>
23#include <linux/delay.h>
24#include <linux/irq.h>
25#include <linux/io.h>
26#include <linux/can/dev.h>
27#include <linux/can/platform/sja1000.h>
28
29#include "sja1000.h"
30
31#define DRV_NAME "sja1000_isa"
32
33#define MAXDEV 8
34
35MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
36MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
37MODULE_LICENSE("GPL v2");
38
39#define CLK_DEFAULT	16000000	/* 16 MHz */
40#define CDR_DEFAULT	(CDR_CBP | CDR_CLK_OFF)
41#define OCR_DEFAULT	OCR_TX0_PUSHPULL
42
43static unsigned long port[MAXDEV];
44static unsigned long mem[MAXDEV];
45static int __devinitdata irq[MAXDEV];
46static int __devinitdata clk[MAXDEV];
47static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
48static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
49static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
50
51module_param_array(port, ulong, NULL, S_IRUGO);
52MODULE_PARM_DESC(port, "I/O port number");
53
54module_param_array(mem, ulong, NULL, S_IRUGO);
55MODULE_PARM_DESC(mem, "I/O memory address");
56
57module_param_array(indirect, byte, NULL, S_IRUGO);
58MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
59
60module_param_array(irq, int, NULL, S_IRUGO);
61MODULE_PARM_DESC(irq, "IRQ number");
62
63module_param_array(clk, int, NULL, S_IRUGO);
64MODULE_PARM_DESC(clk, "External oscillator clock frequency "
65		 "(default=16000000 [16 MHz])");
66
67module_param_array(cdr, byte, NULL, S_IRUGO);
68MODULE_PARM_DESC(cdr, "Clock divider register "
69		 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
70
71module_param_array(ocr, byte, NULL, S_IRUGO);
72MODULE_PARM_DESC(ocr, "Output control register "
73		 "(default=0x18 [OCR_TX0_PUSHPULL])");
74
75#define SJA1000_IOSIZE          0x20
76#define SJA1000_IOSIZE_INDIRECT 0x02
77
78static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
79{
80	return readb(priv->reg_base + reg);
81}
82
83static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
84				      int reg, u8 val)
85{
86	writeb(val, priv->reg_base + reg);
87}
88
89static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
90{
91	return inb((unsigned long)priv->reg_base + reg);
92}
93
94static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
95				       int reg, u8 val)
96{
97	outb(val, (unsigned long)priv->reg_base + reg);
98}
99
100static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
101					     int reg)
102{
103	unsigned long base = (unsigned long)priv->reg_base;
104
105	outb(reg, base);
106	return inb(base + 1);
107}
108
109static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
110						int reg, u8 val)
111{
112	unsigned long base = (unsigned long)priv->reg_base;
113
114	outb(reg, base);
115	outb(val, base + 1);
116}
117
118static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
119{
120	if (port[idx] || mem[idx]) {
121		if (irq[idx])
122			return 1;
123	} else if (idx)
124		return 0;
125
126	dev_err(pdev, "insufficient parameters supplied\n");
127	return 0;
128}
129
130static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
131{
132	struct net_device *dev;
133	struct sja1000_priv *priv;
134	void __iomem *base = NULL;
135	int iosize = SJA1000_IOSIZE;
136	int err;
137
138	if (mem[idx]) {
139		if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
140			err = -EBUSY;
141			goto exit;
142		}
143		base = ioremap_nocache(mem[idx], iosize);
144		if (!base) {
145			err = -ENOMEM;
146			goto exit_release;
147		}
148	} else {
149		if (indirect[idx] > 0 ||
150		    (indirect[idx] == -1 && indirect[0] > 0))
151			iosize = SJA1000_IOSIZE_INDIRECT;
152		if (!request_region(port[idx], iosize, DRV_NAME)) {
153			err = -EBUSY;
154			goto exit;
155		}
156	}
157
158	dev = alloc_sja1000dev(0);
159	if (!dev) {
160		err = -ENOMEM;
161		goto exit_unmap;
162	}
163	priv = netdev_priv(dev);
164
165	dev->irq = irq[idx];
166	priv->irq_flags = IRQF_SHARED;
167	if (mem[idx]) {
168		priv->reg_base = base;
169		dev->base_addr = mem[idx];
170		priv->read_reg = sja1000_isa_mem_read_reg;
171		priv->write_reg = sja1000_isa_mem_write_reg;
172	} else {
173		priv->reg_base = (void __iomem *)port[idx];
174		dev->base_addr = port[idx];
175
176		if (iosize == SJA1000_IOSIZE_INDIRECT) {
177			priv->read_reg = sja1000_isa_port_read_reg_indirect;
178			priv->write_reg = sja1000_isa_port_write_reg_indirect;
179		} else {
180			priv->read_reg = sja1000_isa_port_read_reg;
181			priv->write_reg = sja1000_isa_port_write_reg;
182		}
183	}
184
185	if (clk[idx])
186		priv->can.clock.freq = clk[idx] / 2;
187	else if (clk[0])
188		priv->can.clock.freq = clk[0] / 2;
189	else
190		priv->can.clock.freq = CLK_DEFAULT / 2;
191
192	if (ocr[idx] != -1)
193		priv->ocr = ocr[idx] & 0xff;
194	else if (ocr[0] != -1)
195		priv->ocr = ocr[0] & 0xff;
196	else
197		priv->ocr = OCR_DEFAULT;
198
199	if (cdr[idx] != -1)
200		priv->cdr = cdr[idx] & 0xff;
201	else if (cdr[0] != -1)
202		priv->cdr = cdr[0] & 0xff;
203	else
204		priv->cdr = CDR_DEFAULT;
205
206	dev_set_drvdata(pdev, dev);
207	SET_NETDEV_DEV(dev, pdev);
208
209	err = register_sja1000dev(dev);
210	if (err) {
211		dev_err(pdev, "registering %s failed (err=%d)\n",
212			DRV_NAME, err);
213		goto exit_unmap;
214	}
215
216	dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
217		 DRV_NAME, priv->reg_base, dev->irq);
218	return 0;
219
220 exit_unmap:
221	if (mem[idx])
222		iounmap(base);
223 exit_release:
224	if (mem[idx])
225		release_mem_region(mem[idx], iosize);
226	else
227		release_region(port[idx], iosize);
228 exit:
229	return err;
230}
231
232static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
233{
234	struct net_device *dev = dev_get_drvdata(pdev);
235	struct sja1000_priv *priv = netdev_priv(dev);
236
237	unregister_sja1000dev(dev);
238	dev_set_drvdata(pdev, NULL);
239
240	if (mem[idx]) {
241		iounmap(priv->reg_base);
242		release_mem_region(mem[idx], SJA1000_IOSIZE);
243	} else {
244		if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
245			release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
246		else
247			release_region(port[idx], SJA1000_IOSIZE);
248	}
249	free_sja1000dev(dev);
250
251	return 0;
252}
253
254static struct isa_driver sja1000_isa_driver = {
255	.match = sja1000_isa_match,
256	.probe = sja1000_isa_probe,
257	.remove = __devexit_p(sja1000_isa_remove),
258	.driver = {
259		.name = DRV_NAME,
260	},
261};
262
263static int __init sja1000_isa_init(void)
264{
265	int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
266
267	if (!err)
268		printk(KERN_INFO
269		       "Legacy %s driver for max. %d devices registered\n",
270		       DRV_NAME, MAXDEV);
271	return err;
272}
273
274static void __exit sja1000_isa_exit(void)
275{
276	isa_unregister_driver(&sja1000_isa_driver);
277}
278
279module_init(sja1000_isa_init);
280module_exit(sja1000_isa_exit);
281